CN104650378A - Preparation method of cellulose packaging film - Google Patents
Preparation method of cellulose packaging film Download PDFInfo
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- CN104650378A CN104650378A CN201410754458.6A CN201410754458A CN104650378A CN 104650378 A CN104650378 A CN 104650378A CN 201410754458 A CN201410754458 A CN 201410754458A CN 104650378 A CN104650378 A CN 104650378A
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- cellulose
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- General Preparation And Processing Of Foods (AREA)
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Abstract
The invention provides a preparation method of a cellulose packaging film with high oxygen permeation and moisture permeation performances, and belongs to the field of preparation of fruit and vegetable packaging films. According to the invention, the cellulose packaging film with high oxygen permeation and moisture permeation performances is physically prepared in solidification bath by using a conversion method. The cellulose packaging film prepared by the method is high in oxygen permeation and moisture permeation performances; meanwhile, the mechanical performance of the packaging film meets the demand in daily life.
Description
Technical field
The invention belongs to vegetable and fruit packaging field of membrane preparation.
Background technology
Fresh fruit and vegetables are fresh goods that water content is very high, the activity such as breathing and transpiration is still proceeded after gathering, be easy to phenomenons such as producing shrinkage, weightlessness, wilting, go bad, therefore, preserving fruit and vegetable utilizing is that fruits and vegetables are produced, storage and the major issue of sales section, and in fresh Fresh-keeping Packaging for Fruits and Vegetables, the barrier property of packing film receives publicity just day by day.Current petroleum base fresh-keeping packaging film selects pore former to form material to prepare porous-film, to improve oxygen flow water vapour permeability as abscess usually.But traditional macromolecular material (PE, PP, PVDC, PET, EVA) can be exerted heavy pressures on to environment, and also constantly consume non-renewable petroleum resources.Comparatively speaking, Mierocrystalline cellulose has nontoxic, degradable, stable chemical nature and cheap advantage, its biocompatibility and film forming properties good, the packing film prepared with it can be applied to food product pack safely, but between cellulosic molecule, there is a large amount of hydrogen bonds, solution is polar system, thus chemical pore former as the consistency of polyoxyethylene glycol etc. and cellulose solution and dispersiveness poor.
Summary of the invention
The object of this invention is to provide a kind of Mierocrystalline cellulose packing film preparation method with high oxygen flow water vapour permeability.
The present invention is achieved by the following technical programs: a kind of Mierocrystalline cellulose packing film preparation method, comprises cellulose activation, cellulose dissolution and molding three step;
Described cellulose activation step is, adds the KMnO of 0.2% in N,N-dimethylacetamide (DMAc)
4, add the bleached hardwood pulp dregs of rice after pulverizing, in 140 DEG C of oil baths, carry out cellulose activation 1h, pulp is stand-by after squeezing;
Described cellulose dissolution step is that 11wt%LiCl is dissolved in DMAc completely, adds the cellulose pulp after activation, and at 100 DEG C, heated and stirred 2h is that gel stops to solution, and ambient temperatare puts certain hour, is namely dissolved into transparent cellulose solution;
Described masking step is, cellulose solution mobility is increased for ease of film forming, in whipping process, cellulose solution is heated to 100 DEG C again, adopt the knifing method masking that thickness is controlled, obtain the asymmetric membrane that thickness is about 50 μm after several minutes in rapid immersion precipitation bath (ethanol), wash away residual LiCl/DMAc solvent subsequently, through aqueous glycerin solution plastics processing, seasoning under room temperature, obtains cellulose membrane.
The present invention has following beneficial effect:
There is finger-like pore in the Mierocrystalline cellulose packing film inside adopting the method to prepare, this feature structure and abundant oh group make film exhibits go out higher oxygen flow and water vapour permeability, and the mechanical property of packing film reaches 12.7MPa simultaneously, can meet needed for daily life.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.
Specific embodiment: preparation process of the present invention comprises cellulose activation, cellulose dissolution and molding three step;
Described cellulose activation step is, adds the KMnO of 0.2% in N,N-dimethylacetamide (DMAc)
4, add the bleached hardwood pulp dregs of rice after pulverizing, in 140 DEG C of oil baths, carry out cellulose activation 1h, pulp is stand-by after squeezing;
Described cellulose dissolution step is that 11wt%LiCl is dissolved in DMAc completely, adds the cellulose pulp after activation, and at 100 DEG C, heated and stirred 2h is that gel stops to solution, and ambient temperatare puts certain hour, is namely dissolved into transparent cellulose solution;
Described masking step is, cellulose solution mobility is increased for ease of film forming, in whipping process, cellulose solution is heated to 100 DEG C again, adopt the knifing method masking that thickness is controlled, obtain the asymmetric membrane that thickness is about 50 μm after several minutes in rapid immersion precipitation bath (ethanol), wash away residual LiCl/DMAc solvent subsequently, through aqueous glycerin solution plastics processing, seasoning under room temperature, obtains cellulose membrane.
Carrying out fiber observation to the cellulose membrane of preparation, there is finger-like pore in the cellulose membrane inside of preparation, and this feature structure and abundant oh group make film exhibits go out higher oxygen flow and water vapour permeability, and its oxygen permeability coefficient is 0.11cm
3mm/m
2dkPa, moisture permeable coefficient is 0.06cm
3mm/m
2dkPa, physical strength reaches 12.7MPa.
Above content is the further description done the present invention in conjunction with concrete embodiment, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (1)
1. a Mierocrystalline cellulose packing film preparation method, is characterized in that: comprise cellulose activation, cellulose dissolution and molding three step;
Described cellulose activation step is, adds the KMnO of 0.2% in N,N-dimethylacetamide (DMAc)
4, add the bleached hardwood pulp dregs of rice after pulverizing, in 140 DEG C of oil baths, carry out cellulose activation 1h, pulp is stand-by after squeezing;
Described cellulose dissolution step is that 11wt%LiCl is dissolved in DMAc completely, adds the cellulose pulp after activation, and at 100 DEG C, heated and stirred 2h is that gel stops to solution, and ambient temperatare puts certain hour, is namely dissolved into transparent cellulose solution;
Described masking step is, cellulose solution mobility is increased for ease of film forming, in whipping process, cellulose solution is heated to 100 DEG C again, adopt the knifing method masking that thickness is controlled, obtain the asymmetric membrane that thickness is about 50 μm after several minutes in rapid immersion precipitation bath (ethanol), wash away residual LiCl/DMAc solvent subsequently, through aqueous glycerin solution plastics processing, seasoning under room temperature, obtains cellulose membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410754458.6A CN104650378A (en) | 2014-12-11 | 2014-12-11 | Preparation method of cellulose packaging film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410754458.6A CN104650378A (en) | 2014-12-11 | 2014-12-11 | Preparation method of cellulose packaging film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104650378A true CN104650378A (en) | 2015-05-27 |
Family
ID=53242046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410754458.6A Pending CN104650378A (en) | 2014-12-11 | 2014-12-11 | Preparation method of cellulose packaging film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104650378A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107840977A (en) * | 2017-10-20 | 2018-03-27 | 天津市宝德包装有限公司 | A kind of fresh-keeping preparation method with oxygen flow moisture-inhibiting packaging film of vegetables and fruits |
-
2014
- 2014-12-11 CN CN201410754458.6A patent/CN104650378A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107840977A (en) * | 2017-10-20 | 2018-03-27 | 天津市宝德包装有限公司 | A kind of fresh-keeping preparation method with oxygen flow moisture-inhibiting packaging film of vegetables and fruits |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150527 |
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| WD01 | Invention patent application deemed withdrawn after publication |